FEATURES
Trace Engineering Co. Inc. Tel (360) 435-8826 Part Number 3179
5916 195
th
Street, NE Fax (360) 435-2229 Effective August 6, 1998
Arlington, WA 98223 USA www.traceengineering.com Page
11
Crystal Controlled Time Base
Proper frequency regulation is assured with the use of a crystal. Battery voltage and power have no
effect on the inverter’s operating frequency.
Stand-by Battery Charger
The Stand-by feature includes an internal battery charger and automatic transfer relay. This allows
the unit to operate as a battery charger or an inverter (but not at the same time). An external source
of AC power (i.e. shore power or generator) must be supplied to the inverter’s AC input to allow it to
operate as a battery charger. When the unit is operating as a charger its AC output is powered by
the external AC source. See the Three-Stage Battery Charger section beginning on Page 52 for an
in-depth description of this charger.
Transfer Switching Speed
While this inverter is not designed specifically to operate as an un-interruptable power supply (UPS)
system, its transfer time is normally fast enough to hold up computers in the event of a power outage.
The transfer time is a maximum of 32 milliseconds (two 60Hz AC cycles). Success as UPS will vary
with computer models, and cannot be guaranteed. If this is an issue, buy a small, dedicated UPS for
the specific application.
Automatic Inverter to Charger Transition
The inverter automatically becomes a battery charger whenever AC power is supplied to its AC
inputs. There is a minimum 20-second time delay from the time the inverter senses that AC is
present at its input to when the transfer is made. This delay is built in to provide time for a generator
to spin-up to a stable voltage and avoid relay chattering. The inverter’s AC input is internally
connected to the inverter’s AC output while in the battery charger mode. The maximum power that
can be handled by the inverter’s internal wiring and transfer relay is 30 amps.
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